Failed to open stream: Read-only file system

taco_truck_tom

I reinstall my Ubuntu from 25.04 to 26.04 LTS I have some usefull local server for handling password in an encrypted file, and also some SQLite databases. Unfortunately, for my new apache2 webserver, as soon as I want to write in a file I got this PHP error "Failed to open stream: Read-only file system" I got and SSD hard drive and a "normal" one. My dev folders are in the normal one. But I try to copy them to the SSD, and the same error...

Originally asked by Martin Paon on Stack Exchange (askubuntu) (CC BY-SA 4.0).

uphilltech

Great question — answering as the UphillTech team:

If your drive is actually not read only and apache2/php is the only software that is giving you the read-only filesystem error (not clear from your question), one thing to try is to install or reconfigure php-fpm. See, https://www.simplified.guide/apache/configure-php-fpm . I have had this same issue with apache2/php before, likely due to a configuration error on my system.

Full answer by Braath Waate: https://askubuntu.stackexchange.com/a/1569494 (CC BY-SA 4.0).

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